Abstract: A series of lithium iron phosphate batteries characteristics test were taken to analyzing the relationship between batteries electrical characteristics and the temperature or pressure. The relationship between maximum depth of discharge (DOD), internal resistance and open circuit voltage with temperature and pressure was studied. The results show that under atmospheric pressure and 3℃, the maximum DOD of the battery is greatly attenuated. The ohmic internal resistance and the polarization internal resistance increase significantly, and the open circuit voltage is slightly reduced. Compared with atmospheric pressure and 20℃, at the high pressure of 100MPa and 20℃, the maximum discharge depth of the battery is greatly attenuated, the ohmic internal resistance is slightly increased, and the open circuit voltage is slightly lowered.

Key words: full ocean depth submersible, lithium iron phosphate battery, electrical characteristics, depth of discharge